(Reuters) — U.S. President Barack Obama has told the Pentagon to prepare for the withdrawal of all troops from Afghanistan by the end of the year in case the long-delayed Bilateral Security Agreement (BSA) remains unsigned. White House spokesman Jay Carney said Obama conveyed the message to his Afghan counterpart, Hamid Karzai, in a phone call Tuesday (February 25). Carney says Obama told Karzai that Washington will leave open the possibility of concluding a BSA with Afghanistan later this year, but that the longer it is delayed, […]